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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ac6a74635f533e34b0c7cd49e29af13e9d02c3438b654c2fabff531d5882b3' 
  AND token = 'gQAetoGXr1hvZ4DzSxKMoL73sqIH1zBIcz3MwF0EiEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}